Technology is not used in this type of economy

Need asap write a short paper describing the history and differences between six sigma, waterfall, agile, and scrum models. understanding these models can give you a good idea of how diverse and interesting it development projects can be. describe what the rationale for them is and describe their key features. describe the history behind their development. at least 400 words

Need ! will choose brainliest! discuss the role of abstraction in the history of computer software.

When is it most apprpriate for a development team to change the definition of done